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1/*
2 * linux/arch/arm/lib/copy_page-armv4mc.S
3 *
4 * Copyright (C) 1995-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * ASM optimised string functions
11 */
12#include <linux/linkage.h>
13#include <linux/init.h>
14#include <asm/constants.h>
15
16 .text
17 .align 5
18/*
19 * ARMv4 mini-dcache optimised copy_user_page
20 *
21 * We flush the destination cache lines just before we write the data into the
22 * corresponding address. Since the Dcache is read-allocate, this removes the
23 * Dcache aliasing issue. The writes will be forwarded to the write buffer,
24 * and merged as appropriate.
25 *
26 * Note: We rely on all ARMv4 processors implementing the "invalidate D line"
27 * instruction. If your processor does not supply this, you have to write your
28 * own copy_user_page that does the right thing.
29 */
30ENTRY(v4_mc_copy_user_page)
31 stmfd sp!, {r4, lr} @ 2
32 mov r4, r0
33 mov r0, r1
34 bl map_page_minicache
35 mov r1, #PAGE_SZ/64 @ 1
36 ldmia r0!, {r2, r3, ip, lr} @ 4
371: mcr p15, 0, r4, c7, c6, 1 @ 1 invalidate D line
38 stmia r4!, {r2, r3, ip, lr} @ 4
39 ldmia r0!, {r2, r3, ip, lr} @ 4+1
40 stmia r4!, {r2, r3, ip, lr} @ 4
41 ldmia r0!, {r2, r3, ip, lr} @ 4
42 mcr p15, 0, r4, c7, c6, 1 @ 1 invalidate D line
43 stmia r4!, {r2, r3, ip, lr} @ 4
44 ldmia r0!, {r2, r3, ip, lr} @ 4
45 subs r1, r1, #1 @ 1
46 stmia r4!, {r2, r3, ip, lr} @ 4
47 ldmneia r0!, {r2, r3, ip, lr} @ 4
48 bne 1b @ 1
49 ldmfd sp!, {r4, pc} @ 3
50
51 .align 5
52/*
53 * ARMv4 optimised clear_user_page
54 *
55 * Same story as above.
56 */
57ENTRY(v4_mc_clear_user_page)
58 str lr, [sp, #-4]!
59 mov r1, #PAGE_SZ/64 @ 1
60 mov r2, #0 @ 1
61 mov r3, #0 @ 1
62 mov ip, #0 @ 1
63 mov lr, #0 @ 1
641: mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line
65 stmia r0!, {r2, r3, ip, lr} @ 4
66 stmia r0!, {r2, r3, ip, lr} @ 4
67 mcr p15, 0, r0, c7, c6, 1 @ 1 invalidate D line
68 stmia r0!, {r2, r3, ip, lr} @ 4
69 stmia r0!, {r2, r3, ip, lr} @ 4
70 subs r1, r1, #1 @ 1
71 bne 1b @ 1
72 ldr pc, [sp], #4
73
74 __INITDATA
75
76 .type v4_mc_user_fns, #object
77ENTRY(v4_mc_user_fns)
78 .long v4_mc_clear_user_page
79 .long v4_mc_copy_user_page
80 .size v4_mc_user_fns, . - v4_mc_user_fns